Olefin dihydroxylation mediated by Os-Zn-Al hydrotalcite-like catalyst: The scope and reactivity using various co-oxidants

Olefin dihydroxylation mediated by Os-Zn-Al hydrotalcite-like catalyst: The scope and reactivity using various co-oxidants

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The heterogeneous oxidation of olefins to vicinal diols was investigated using an Os-Zn-Al hydrotalcite-like catalyst (HTlc).The Os-Zn-Al HTlc was synthesised by the co-precipitation method and characterised fully using XRD, FT-IR, TEM, SEM, ICP-OES and BET surface area measurements.The ability of the synthesised Os-Zn-Al HTlc to catalytically dihydroxylate olefins to vicinal diols using various co-oxidants (air, NMO, K3Fe(CN)6, H2O2 and t-BuOOH) was investigated.

The focus was mostly on N-methylmorpholine N-oxide (NMO) and thorogood 804-3236 K3Fe(CN)6 since they are well established co-oxidants for osmium catalysed dihydroxylation.When NMO was used, 100 % olefin conversion was achieved for all olefins tested.While, 100% conversion was only achieved with electron rich olefins when K3Fe(CN)6 was used as co-oxidant.

Recyclability and leaching tests were done, and it was found that the catalyst could be recycled at least 3 times in the NMO system and the K3Fe(CN)6-K2CO3 system kryolan anti shine powder was found to be truly heterogeneous.